header {
    display: flex;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(26, 26, 26, 0.1);
    background-clip: content-box;
    height: 56px;
    line-height: 56px;
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    z-index: 999;

    a {
        padding: 0 15px;
        display: inline-block;

        &:hover {
            color: #175199;
        }

        &.active {
            font-weight: bold;
        }
    }

    nav {
        flex-grow: 1;
        display: flex;

        &.show {
            display: inline-block;
        }
    }
}


.logo {
    width: 130px;
    line-height: 56px;
    flex-basis: 130px;
    margin-left: 10px;
    position: relative;

    &::before {
        position: absolute;
        width: 130px;
        content: 'ReactSsr';
        font-size: 18px;
        color: #0088ff;
        letter-spacing: 5px;
    }
}

.header-nav {
    flex-grow: 1;
    line-height: 56px;
    white-space: nowrap;
}